MPD: pcm/FloatConvert.hxx Source File

MPD 0.20.15

FloatConvert.hxx
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1 /*
2 * Copyright 2003-2017 The Music Player Daemon Project
3 * http://www.musicpd.org
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 */
19
20 #ifndef MPD_PCM_FLOAT_CONVERT_HXX
21 #define MPD_PCM_FLOAT_CONVERT_HXX
22
23 #include "Traits.hxx"
24
28 template<SampleFormat F, class Traits=SampleTraits<F>>
29 struct FloatToIntegerSampleConvert {
30 typedef SampleTraits<SampleFormat::FLOAT> SrcTraits;
31 typedef Traits DstTraits;
32
33 typedef typename SrcTraits::value_type SV;
34 typedef typename SrcTraits::long_type SL;
35 typedef typename DstTraits::value_type DV;
36
37 static constexpr SV factor = 1 << (DstTraits::BITS - 1);
38
39 gcc_const
40 static DV Convert(SV src) noexcept {
41 return PcmClamp<F, Traits>(SL(src * factor));
42 }
43 };
44
48 template<SampleFormat F, class Traits=SampleTraits<F>>
49 struct IntegerToFloatSampleConvert {
50 typedef SampleTraits<SampleFormat::FLOAT> DstTraits;
51 typedef Traits SrcTraits;
52
53 typedef typename SrcTraits::value_type SV;
54 typedef typename DstTraits::value_type DV;
55
56 static constexpr DV factor = 0.5 / (1 << (SrcTraits::BITS - 2));
57
58 gcc_const
59 static DV Convert(SV src) noexcept {
60 return DV(src) * factor;
61 }
62 };
63
64 #endif
SampleTraits< SampleFormat::FLOAT >::value_type
float value_type
Definition: Traits.hxx:148
FloatToIntegerSampleConvert
Convert from float to an integer sample format.
Definition: FloatConvert.hxx:29
SampleTraits< SampleFormat::FLOAT >
Definition: Traits.hxx:147
Traits.hxx
FloatToIntegerSampleConvert::Convert
static gcc_const DV Convert(SV src) noexcept
Definition: FloatConvert.hxx:40
IntegerToFloatSampleConvert::SrcTraits
Traits SrcTraits
Definition: FloatConvert.hxx:51
IntegerToFloatSampleConvert::SV
SrcTraits::value_type SV
Definition: FloatConvert.hxx:53
FloatToIntegerSampleConvert::factor
static constexpr SV factor
Definition: FloatConvert.hxx:37
IntegerToFloatSampleConvert::DstTraits
SampleTraits< SampleFormat::FLOAT > DstTraits
Definition: FloatConvert.hxx:50
gcc_const
#define gcc_const
Definition: Compiler.h:109
FloatToIntegerSampleConvert::SV
SrcTraits::value_type SV
Definition: FloatConvert.hxx:33
IntegerToFloatSampleConvert
Convert from an integer sample format to float.
Definition: FloatConvert.hxx:49
SampleTraits< SampleFormat::FLOAT >::long_type
float long_type
Definition: Traits.hxx:153
IntegerToFloatSampleConvert::DV
DstTraits::value_type DV
Definition: FloatConvert.hxx:54
FloatToIntegerSampleConvert::SrcTraits
SampleTraits< SampleFormat::FLOAT > SrcTraits
Definition: FloatConvert.hxx:30
FloatToIntegerSampleConvert::SL
SrcTraits::long_type SL
Definition: FloatConvert.hxx:34
IntegerToFloatSampleConvert::factor
static constexpr DV factor
Definition: FloatConvert.hxx:56
FloatToIntegerSampleConvert::DV
DstTraits::value_type DV
Definition: FloatConvert.hxx:35
FloatToIntegerSampleConvert::DstTraits
Traits DstTraits
Definition: FloatConvert.hxx:31
IntegerToFloatSampleConvert::Convert
static gcc_const DV Convert(SV src) noexcept
Definition: FloatConvert.hxx:59